Can you make non-standard, drilled, threaded or hollow steel balls to drawing?

Yes. We produce non-standard diameters to decimal size, drilled (through/blind), threaded (metric & UNC/UNF), stepped, half-spherical and hollow balls, with features controlled for…

How do you inspect the balls and what quality documents do you provide?

Every batch goes through 100% automated machine-vision sorting for size, roundness, surface defects and appearance, supplemented by hardness, roundness (Roundness/Eccentricity), mi…

Can you supply hardened bearing balls such as 52100, 440C or M50, and what hardness can you reach?

Yes. Chrome steel 52100 is through-hardened to approximately HRC 60–66; 440C martensitic stainless to HRC 58–65; M50 high-speed/aircraft alloy to HRC 62–66 with high-temperature st…

Which is better for my application, 304 or 316 stainless steel balls?

304 is the economical choice for indoor, freshwater, dry-food and decorative service. 316 adds 2–3% Mo and 10–14% Ni (PREN ~23–28 vs 304's ~18–20), so choose 316 for seawater, coas…

What diameter sizes and tolerance grades (ABMA/ISO) can you provide?

Diameter range typically 0.5–50.8 mm (0.020–2.000 in), metric and inch series, with non-standard decimal sizes to drawing. Precision grades per ABMA/ISO 3290 from G3 to G1000; comm…

What is your lead time and can you supply steadily?

Standard sizes and common materials are often in stock and can ship in 5–10 days. Standard production is 15–30 days; non-standard sizes, special alloys or CNC features take 20–60 d…

What is your MOQ and can I order small quantities or samples?

Standard catalog sizes have low MOQ and can be ordered by the bag/piece, with samples available. Non-standard and CNC-machined balls usually start from 50–500 pcs depending on setu…

What materials and grades of steel balls do you supply?

Common grades: carbon steel 1010/1045/1085, chrome steel 52100 (100Cr6/SUJ2), martensitic stainless 420/440C/440B, austenitic stainless 304/304L/316/316L, plus specialty alloys on …

Are you a factory or a trading company, and can you do OEM/ODM customization?

We are a direct steel-ball manufacturer (factory) with in-house cold heading, grinding, heat treatment, CNC machining and automated inspection. We support full OEM/ODM: material gr…

🌍 Haimen City Mingzhu Steel Ball Co., Ltd. Since 1992 ⭐ 34+ Year Industry Experience ✓ Verified Elite Supplier

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What are your payment terms and shipping/delivery options?

Payment: T/T 30% deposit + 70% balance before shipment (standard), L/C at sight for large orders, PayPal/Western Union for samples, and OA/Net-30 for approved repeat customers. Del…

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